3 GPP TSGRAN WG 4 Meeting 94 ebis
3 GPP TSG-RAN WG 4 Meeting #94 -e-bis Electronic Meeting, April 20 th – April 30 th 2020 R 4 -2005305 WF on NR Mobility Enhancements RRM requirements Intel Corporation
Background • Agreements in this way forward are based on email discussion in R 42005392 Email discussion summary for [94 e Bis][108] NR_Mob_enh_RRM • Agreements in the last RAN 4#94 -e meeting can be found in: • R 4 -2002173 Email discussion summary for RAN 4#94 e_#50_NR_Mob_enh_RRM • R 4 -2002224 WF on NR Mobility Enhancements RRM requirements
DAPS handover: Agreement in 1 st round • Issue 1 -1: Interruption in intra-frequency DAPS HO D 1 for 60 KHz Agreement: 4 slots • Issue 1 -2: interruption when UL Tx overlap in time Agreement: no need to capture this in RAN 4 specification since corresponding UE behaviour has already been captured in RAN 1 specification. • Issue 1 -3: different interruption during Delay (1) and (2) Agreement: different interruption during Delay (1) and (2) has already been considered and reflected in existing specification. RAN 4 will not revisit previous agreement • Issue 1 -4: Power imbalance in side condition for interruption requirements Agreement: RAN 4 will not capture side condition of power imbalance in core requirement. The issue can be discussed in performance part. • Issue 1 -8: RRM measurement during DAPS handover: Agreement: it is up to UE implementation whether to perform RRM measurement on the frequencies of source cell and target cell during DAPS handover procedure.
DAPS handover: way forward for 2 nd round • Side condition for sync DAPS HO regarding MRTD/MTTD at UE side is to be introduced. If side condition is not met, async DAPS HO is assumed. UE which can only support sync DAPS HO doesn’t have to meet the requirement for sync DAPS HO. • Whether existing intra-frequency and intra-band inter-frequency DAPS HO requirement can apply for both sync and async scenarios is FFS and The followings will be decided in RAN 4#-95 -e • Whether the existing interruption requirements for intra-frequency DAPS HO are only applied for sync scenario. • Whether the existing interruption requirements for intra-band inter-frequency DAPS HO can be applied are only applied for async scenario.
DAPS handover: way forward for 2 nd round – cont. • Side condition for intra-frequency sync DAPS HO: o UE which only support sync DAPS HO shall meet existing DAPS HO requirement as long as: - - - Option 1: it is assumed that source and target cells are co-located. - 3 us MRTD and 5. 21 us MTTD between source and target cells is not exceeded: Note: If the receive time difference exceeds the cyclic prefix length of that SCS, demodulation performance degradation is expected for the first symbol of the slot. Option 2: it is assumed that source and target cells can be non-co-located. - 33 us MRTD and 34. 6 us MTTD between source and target cells is not exceeded Note: If the receive time difference exceeds the cyclic prefix length of that SCS, demodulation performance degradation is expected for the first symbol of the slot. Option 3: specify “Tight Sync” and “Loose Sync” for sync DAPS handover capabilities. - Tight Sync : 3 us MRTD and 5. 21 us MTTD between source and target cells is not exceeded: Note: If the receive time difference exceeds the cyclic prefix length of that SCS, demodulation performance degradation is expected for the first symbol of the slot. - Loose Sync : 33 us MRTD and 34. 6 us MTTD between source and target cells is not exceeded Note: If the receive time difference exceeds the cyclic prefix length of that SCS, demodulation performance degradation is expected for the first symbol of the slot. • Side condition for intra-band inter-frequency sync DAPS HO: o UE which only support sync DAPS HO shall meet existing DAPS HO requirement as long as: - - - Option 1: it is assumed that source and target cells are co-located. - 3 us MRTD and 5. 21 us MTTD between source and target cells is not exceeded: Note: If the receive time difference exceeds the cyclic prefix length of that SCS, demodulation performance degradation is expected for the first symbol of the slot. Option 2: it is assumed that source and target cells can be non-co-located. - 33 us MRTD and 34. 6 us MTTD between source and target cells is not exceeded Note: If the receive time difference exceeds the cyclic prefix length of that SCS, demodulation performance degradation is expected for the first symbol of the slot. Option 3: specify “Tight Sync” and “Loose Sync” for sync DAPS handover capabilities. - Tight Sync : 3 us MRTD and 5. 21 us MTTD between source and target cells is not exceeded: Note: If the receive time difference exceeds the cyclic prefix length of that SCS, demodulation performance degradation is expected for the first symbol of the slot. - Loose Sync : 33 us MRTD and 34. 6 us MTTD between source and target cells is not exceeded Note: If the receive time difference exceeds the cyclic prefix length of that SCS, demodulation performance degradation is expected for the first symbol of the slot.
DAPS handover: way forward for 2 nd round – cont. • Side condition for FR 1 -FR 1 inter-band sync DAPS HO: o UE which only support sync DAPS HO shall meet existing DAPS HO requirement as long as: - maximum of 33 us MRTD and 34. 6 us MTTD between source and target cells is not exceeded. • Side condition for FR 1 -FR 2 inter-band sync DAPS HO: o UE which only support sync DAPS HO shall meet existing DAPS HO requirement as long as: - maximum of 25 us MRTD and 26. 1 us MTTD between source and target cells is not exceeded.
DAPS handover: way forward for 2 nd round – cont. • Other conditions for intra-frequency DAPS HO: Intra-frequency DAPS HO requirements apply only if • the centre frequency of the SSB of the source cell and the centre frequency of the SSB of the target cell are the same, and • the subcarrier spacing of the two SSBs are also the same • the active BWP of source cell contains the initial BWP of source cell. • the active BWP of target cell contains the initial BWP of target cell. • active DL/UP BWPs of target cell is confined within the active DL/UL BWPs of source cell
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